<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>Vue 测试实例 - 菜鸟教程(runoob.com)</title>
    <script src="https://cdn.staticfile.org/vue/3.2.36/vue.global.min.js"></script>
</head>

<body>
    <div id="hello-vue" class="demo">
        {{ message }}
    </div>

    <script>
        const HelloVueApp = {
            data() {
                return {
                    message: 'Hello Vue!!'
                }
            }
        }

        Vue.createApp(HelloVueApp).mount('#hello-vue')
    </script>

    <div id="app" class="demo"></div>

    <script>
        const app = Vue.createApp({
            data() {
                return { count: 4 }
            },
            methods: {
                increment(){
                    this.count ++;
                }
            },
        })

        const vm = app.mount('#app')

        document.write(vm.$data.count) // => 4
        document.write("<br>")
        document.write(vm.count)       // => 4
        document.write("<br>")
        // 修改 vm.count 的值也会更新 $data.count
        vm.count = 5
        document.write(vm.$data.count) // => 5
        document.write("<br>")
        // 反之亦然
        vm.$data.count = 6
        document.write(vm.count) // => 6
        document.write("<br>");
        vm.increment();
        document.write(vm.count);
    </script>
</body>

</html>